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< h1 >< a class = "toc-backref" href = "../refmanual.html#id1393" > Sequences</ a ></ h1 >
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< p id = "label-sequences" > Compile-time sequences of types are one of the basic concepts of C++
template metaprogramming. Differences in types of objects being
manipulated is the most common point of variability of similar, but
not identical designs, and these are a direct target for
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metaprogramming. Templates were originally designed to address this
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exact problem. However, without predefined mechanisms for
representing and manipulating < em > sequences</ em > of types as opposed to
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standalone template parameters, high-level template metaprogramming
is severely limited in its capabitilies.</ p >
< p > The MPL recognizes the importance of type sequences as a fundamental
building block of many higher-level metaprogramming designs by
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providing us with a conceptual framework for formal reasoning
and understanding of sequence properties, guarantees and
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characteristics, as well as a first-class implementation of that
framework — a wealth of tools for concise, convenient,
conceptually precise and efficient sequence manipulation.</ p >
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